64776782670 has 64 divisors (see below), whose sum is σ = 158762695680. Its totient is φ = 16910006400.

The previous prime is 64776782657. The next prime is 64776782683. The reversal of 64776782670 is 7628767746.

It is an interprime number because it is at equal distance from previous prime (64776782657) and next prime (64776782683).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 302251 + ... + 470009.

It is an arithmetic number, because the mean of its divisors is an integer number (2480667120).

Almost surely, 2^64776782670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64776782670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79381347840).

64776782670 is an abundant number, since it is smaller than the sum of its proper divisors (93985913010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64776782670 is a wasteful number, since it uses less digits than its factorization.

64776782670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168041.

The product of its (nonzero) digits is 33191424, while the sum is 60.

The spelling of 64776782670 in words is "sixty-four billion, seven hundred seventy-six million, seven hundred eighty-two thousand, six hundred seventy".